3. asleep, sleeping, sleepy

asleep是表语性形容词，意思是“睡着的”。

Be quiet. The baby is asleep. 轻点声。孩子睡着了。

sleeping在句中可以作定语，也可以作表语。

He tiptoed into his room in order not to wake his sleeping parents.　他踮着脚尖走进屋里，不想吵醒熟睡的父母。

sleepy的意思是“困倦的”。

I felt sleepy because I had stayed up late last night.

因为昨晚睡得很晚，我觉得很困倦。

4. ill, sick

在表示“生病”的时候，ill是一个表语性形容词，sick可以作表语，也可以作定语。

He has been ill for a long time. 他病了很长时间。

He went to the hospital to take care of his sick mother.

他去医院照顾生病的母亲。

此外，ill还可以表示“不好的”;sick可以表示“厌烦”。

We don’t like Jack because of his ill manners.

我们不喜欢杰克，他没有礼貌。

We are sick of the same breakfast every day.

我们厌倦了每天吃同样的早餐。